保护措施预防撞击和贯穿是用碳纤维和聚芳族胺，和透过高密度扩大的聚苯乙烯制成的垫塞。

Protection against impacts and perforation is ensured by a shell in carbon fibers and aramid, and by an expanded polystyrene inner padding with high density.

youdao

采用正交设计法分析了聚磷酸胺(APP)、季戊四醇(PER)、三聚氰胺(MEL)作为一种混合体系对聚苯乙烯(PS)的阻燃作用。

The flame retardance of a composite system consisting of ammonium polyphosphate (APP), pentaerythritol (PER) and melamine (MEL) used for polystyrene (PS) was studied with orthogonal design method.

youdao